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Electrophoretic display with enhanced contrast

  • US 9,140,952 B2
  • Filed: 04/21/2011
  • Issued: 09/22/2015
  • Est. Priority Date: 04/22/2010
  • Status: Active Grant
First Claim
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1. An electrophoretic display comprisinga) a first layer and a second layer, wherein the first layer is on the viewing side and comprises only one electrode which is a common electrode, the second layer comprises a plurality of pixel electrodes, and the total area of all the pixel electrodes is less than 30% of the area of the second layer;

  • b) a plurality of display cells which are filled with an electrophoretic fluid and sandwiched between the first layer and the second layer, which fluid comprises charged pigment particles dispersed in a solvent or solvent mixture; and

    c) a background layer which has the same color as the solvent or solvent mixture and the color of the background layer is more intense than the color of the solvent or solvent mixture;

    wherein said display is capable of displaying the color of the charged pigment particles and the color of the solvent or solvent mixture seen at the viewing side, and the color of the solvent or solvent mixture is enhanced by the background layer.

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